Application of timing advance commands of an access channel message to a timing advance group of multiple timing advance groups

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a UE may receive an indication of a first Network TAG associated with a first wireless link and a second TAG associated with a Node Receive configuration information UE second wireless link for a serving cell. The UE may transmit a first RACH message based at least in part on a failure of a BFR procedure associated with at least one of a first BFD-RS set associated with the first wireless link or a second BFD-Receive RS set associated with the second wireless link. The UE may receive, based at least in part on transmitting the first RACH message, a second RACH message that indicates a TAC for the serving cell. The UE may communicate, with the serving cell, based at least in part on application of the TAC to the first TAG or the second TAG.

1 . A user equipment (UE) for wireless communication, comprising:
 a memory; and   one or more processors, coupled to the memory, configured to:
 receive an indication of a first timing advance group (TAG) associated with a first wireless link and a second TAG associated with a second wireless link for a serving cell; 
 transmit a first random access channel (RACH) message on the serving cell based at least in part on a failure of a beam failure recovery (BFR) procedure associated with at least one beam failure detection (BFD) reference signal (RS) set from among a first BFD-RS set associated with the first wireless link or a second BFD-RS set associated with the second wireless link; 
 receive, based at least in part on transmitting the first RACH message, a second RACH message that indicates a timing advance command (TAC) for the serving cell; and 
 communicate, with the serving cell, based at least in part on application of the TAC to the first TAG or the second TAG, the application of the TAC to the first TAG or the second TAG being based at least in part on one or more of:
 whether a new candidate beam, associated with the first wireless link or the second wireless link, is identified before the transmission of the first RACH message, 
 a BFD-RS set of the first BFD-RS set or the second BFD-RS set, that is not the at least one BFD-RS set, for which the BFR procedure is not triggered, or 
 a synchronization signal block (SSB) associated with the first RACH message. 
 
   
     
     
         2 . The UE of  claim 1 , wherein the first TAG is associated with a new beam identification RS (NBI-RS) set or the first BFD-RS set based at least in part on one or more of:
 the first TAG and at least one of the NBI-RS set or the first BFD-RS set being associated with a same control resource set (CORESET) pool index value,   a mapping rule, or   the first TAG being configured for the NBI-RS set or the first BFD-RS set.   
     
     
         3 . The UE of  claim 2 , wherein the first TAG is configured for the first NBI-RS set or in the first BFD-RS set based at least in part on a configuration of a TAG identification of the first TAG to:
 the first NBI-RS set or the first BFD-RS set, or   each RS of the first NBI-RS set or the first BFD-RS set.   
     
     
         4 . The UE of  claim 1 , wherein the one or more processors are further configured to fail to identify, before the transmission of the first RACH message, the new candidate beam for any new beam identification RS (NBI-RS) set,
 wherein the application of the TAC to the first TAG or the second TAG is based at least in part on whether the new candidate beam is identified before the transmission of the first RACH message, and   wherein the application of the TAC to the first TAG is based at least in part on the first TAG being a default TAG.   
     
     
         5 . The UE of  claim 4 , wherein the first TAG is a default TAG based at least in part on the first TAG being associated with:
 a first TAG that is associated with a first TAG index,   a lowest TAG identity relative to a second TAG identity associated with the second TAG, or   a default control resource set (CORESET) pool index.   
     
     
         6 . The UE of  claim 1 , wherein the one or more processors are further configured to identify, before the transmission of the first RACH message, the new candidate beam for a new beam identification RS (NBI-RS) set,
 wherein the application of the TAC to the first TAG or the second TAG is based at least in part on whether the new candidate beam is identified before the transmission of the first RACH message, and   wherein the TAC applies to the first TAG based at least in part on the first TAG being associated with the NBI-RS set.   
     
     
         7 . The UE of  claim 1 , wherein the one or more processors are further configured to:
 identify, before the transmission of the first RACH message, a first set of new candidate beams for a first new beam identification RS (NBI-RS) set and a second set of new candidate beams for a second NBI-RS set; and   select a synchronization signal block (SSB) associated with the first set of new candidate beams or the second set of new candidate beams,
 wherein the application of the TAC to the first TAG or the second TAG is based at least in part on whether the new candidate beam is identified before transmitting the first RACH message, and 
 wherein the TAC applies to the first TAG based at least in part on the selected SSB being within the first set of candidate beams and the first TAG being associated with the first NBI-RS set. 
   
     
     
         8 . The UE of  claim 1 , wherein the application of the TAC to the first TAG or the second TAG is based at least in part on a BFD-RS set of the first BFD-RS set or the second BFD-RS set, that is not the at least one BFD-RS set, for which the BFR procedure is not triggered,
 wherein the at least one BFD-RS set is associated with the first TAG and the BFD-RS set that is not the at least one BFD-RS set is associated with the second TAG, and   wherein the TAC applies to the second TAG based at least in part on the BFD-RS set being associated with the second TAG.   
     
     
         9 . The UE of  claim 1 , wherein the application of the TAC to the first TAG or the second TAG is based at least in part on the SSB associated with the first RACH message,
 wherein the SSB and the first TAG are associated with a same control resource set (CORESET) pool index, and   wherein the TAC applies to the first TAG based at least in part on the SSB and the first TAG being associated with the same CORESET pool index.   
     
     
         10 . The UE of  claim 1 , wherein the application of the TAC to the first TAG or the second TAG is based at least in part on the SSB associated with the first RACH message,
 wherein the first TAG is associated with the SSB, and   wherein the TAC applies to the first TAG based at least in part on the first TAG being associated with the SSB.   
     
     
         11 . The UE of  claim 1 , wherein the first TAG is associated with communications with a first network node, and wherein the second TAG is associated with
 communications with a second network node.   
     
     
         12 . The UE of  claim 1 , wherein the one or more processors are further configured to identify a beam failure for the at least one BFD-RS set that triggers the transmission of the first RACH message. 
     
     
         13 . A method of wireless communication performed by a user equipment (UE), comprising:
 receiving an indication of a first timing advance group (TAG) associated with a first wireless link and a second TAG associated with a second wireless link for a serving cell;   transmitting a first random access channel (RACH) message on the serving cell based at least in part on a failure of a beam failure recovery (BFR) procedure associated with at least one beam failure detection (BFD) reference signal (RS) set from among a first BFD-RS set associated with the first wireless link or a second BFD-RS set associated with the second wireless link;   receiving, based at least in part on transmitting the first RACH message, a second RACH message that indicates a timing advance command (TAC) for the serving cell; and   communicating, with the serving cell, based at least in part on application of the TAC to the first TAG or the second TAG, the application of the TAC to the first TAG or the second TAG being based at least in part on one or more of:
 whether a new candidate beam, associated with the first wireless link or the second wireless link, is identified before the transmission of the first RACH message, 
 a BFD-RS set of the first BFD-RS set or the second BFD-RS set, that is not the at least one BFD-RS set, for which the BFR procedure is not triggered, or 
 a synchronization signal block (SSB) associated with the first RACH message. 
   
     
     
         14 . The method of  claim 13 , wherein the first TAG is associated with a new beam identification RS (NBI-RS) set or the first BFD-RS set based at least in part on one or more of:
 the first TAG and at least one of the NBI-RS set or the first BFD-RS set being associated with a same control resource set (CORESET) pool index value,   a mapping rule, or   the first TAG being configured for the NBI-RS set or the first BFD-RS set.   
     
     
         15 . The method of  claim 14 , wherein the first TAG is configured for the first NBI-RS set or in the first BFD-RS set based at least in part on a configuration of a TAG identification of the first TAG to:
 the first NBI-RS set or the first BFD-RS set, or   each RS of the first NBI-RS set or the first BFD-RS set.   
     
     
         16 . The method of  claim 13 , further comprising failing to identify, before the transmission of the first RACH message, the new candidate beam for any new beam identification RS (NBI-RS) set,
 wherein the application of the TAC to the first TAG or the second TAG is based at least in part on whether the new candidate beam is identified before the transmission of the first RACH message, and   wherein the application of the TAC to the first TAG is based at least in part on the first TAG being a default TAG.   
     
     
         17 . The method of  claim 16 , wherein the first TAG is a default TAG based at least in part on the first TAG being associated with:
 a first TAG that is associated with a first TAG index,   a lowest TAG identity relative to a second TAG identity associated with the second TAG, or   a default control resource set (CORESET) pool index.   
     
     
         18 . The method of  claim 13 , further comprising identifying, before the transmission of the first RACH message, the new candidate beam for a new beam identification RS (NBI-RS) set,
 wherein the application of the TAC to the first TAG or the second TAG is based at least in part on whether the new candidate beam is identified before the transmission of the first RACH message, and   wherein the TAC applies to the first TAG based at least in part on the first TAG being associated with the NBI-RS set.   
     
     
         19 . The method of  claim 13 , further comprising:
 identifying, before the transmission of the first RACH message, a first set of new candidate beams for a first new beam identification RS (NBI-RS) set and a second set of new candidate beams for a second NBI-RS set; and   selecting a synchronization signal block (SSB) associated with the first set of new candidate beams or the second set of new candidate beams,
 wherein the application of the TAC to the first TAG or the second TAG is based at least in part on whether the new candidate beam is identified before transmitting the first RACH message, and 
 wherein the TAC applies to the first TAG based at least in part on the selected SSB being within the first set of candidate beams and the first TAG being associated with the first NBI-RS set. 
   
     
     
         20 . The method of  claim 13 , wherein the application of the TAC to the first TAG or the second TAG is based at least in part on a BFD-RS set of the first BFD-RS set or the second BFD-RS set, that is not the at least one BFD-RS set, for which the BFR procedure is not triggered,
 wherein the at least one BFD-RS set is associated with the first TAG and the BFD-RS set that is not the at least one BFD-RS set is associated with the second TAG, and   wherein the TAC applies to the second TAG based at least in part on the BFD-RS set being associated with the second TAG.   
     
     
         21 - 30 . (canceled)